[docs] docs changes for feature matrix

[tejal29]

Description
User facing changes

1. Feature matrix updated
2. small nit removing headers for "Example" and Configuration on Builder page

Before

n/a
After

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Next PRs.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Mentions any output changes.
• Adds documentation as needed: user docs, YAML reference, CLI reference.
• Adds integration tests if needed.

Reviewer Notes

• The code flow looks good.
• Unit test added.
• User facing changes look good.

[codecov]

Codecov Report

Merging #3164 into master will not change coverage.
The diff coverage is n/a.

[container-tools-bot]

Please visit http://35.235.117.222:1313 to view changes to the docs.

[balopat]

let's add in go debug support too as alpha

[tejal29]

let's add in go debug support too as alpha

@balopat done!